Much has been written about the run-up in U.S. crude oil exports over the past five-plus years, and rightly so. Who would have guessed a dozen years ago that the U.S. would soon be producing as much as 13 MMb/d, and exporting one-quarter of it? Exports are only half of the story though. In fact, for every barrel of crude shipped or piped out of the U.S. today, two barrels of crude are shipped, piped, or railed in. Put simply, the U.S. refining sector still needs imported oil — or, more accurately, it can’t use all of the light, sweet crude that’s produced in the Permian and other shale/tight-oil plays in the Lower 48, and it still requires large volumes of the heavier crude that’s produced in Canada, Mexico, and overseas. Today, we begin a blog series on U.S. oil imports with a big-picture look at how crude sourcing for the refining sector has morphed in the Shale Era.

